TM 5-3810-207-20/TO 36C23-3-37-12Figure 28. Clearance light, removal, disassembly, reassembly, and installation.Section II. CRANE ENGINE ASSEMBLY90. GeneralThe six intake and six exhaust valves are located inthe cylinder block on the right side of the engine and areraised and lowered by tappets in contact with thecamshaft. Adjusting screws in the tappets provide themeans of adjusting the valve clearance. The stem ofeach valve rides within a valve guide pressed in theblock. Intake valves control the admission of the fuel-airmixture to the cylinders, while the exhaust valves permitthe expulsion of exhaust gages from the cylinder. Theengine governor is a centrifugal unit gear-driven fromthe camshaft and connected to the carburetor throughadjustable linkage which controls the speed of theengine.91. Valve Cover Assemblya.Removal.Remove the valve cover assemblyas instructed on figure 29.b.Cleaning and Inspection.(1)Clean all parts with an approved cleaningsolvent. Remove the old gasket from the valve cover.(2)Inspect the valve cover for cracks,breaks, bends, and other damage. Replace defectivecover and gasket.(3)Inspect the bypass tube for cracks,breaks, and other damage. Replace defective bypasstube. Replace cover gasket.c.Installation.Install the valve cover assembly asillustrated on figure 29.92. Valve Adjustmenta.Remove the valve covers from the engine (par.91).b.Start the engine, allowing it to heat to normaloperating temperature (TM 5-3810-207-10).c.Adjust the valves as instructed on figure 30.d.Install the valve covers (par. 91).e.The compression test is as follows:(1)Remove the spark plug (par. 76).(2)Place a suitable cylinder compressiontester in the spark plug hole and crank theengine with the starter.(3)The compression gage reading should befrom 80 to 85 psi.(4)Install the spark plug (par. 76).(5)Test the remaining cylinders in a similarmanner.54
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